Photographic apparatus.



RQBRADBURN. PHOTOGRAPHIG APPARATUS.

Patented Oct. 13,1908.

UNITED STATES PATENT OFFICE.

FREDERICK C. BRADBURN, OF ROCHESTER, SPECIALTY COMPANY, OF

NEW YORK, ASSIGNOR TO DAYLIGHT PHOTO ROCHESTER, NEW YORK.

PHOTOGRAPHIC APPARATUS.

No. 901,308. Specification of Letters Patent. Patented Oct. 13, 1908.

Application filed February 23, 1907. Serial No. 358,863.

To all whom it may concern:

Be it known that I, FREDERICK C. BRAD- BURN, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to photographic apparatus and more particularly to an improved day-light developing tray, the object of the invention being to simplify and improve the developing device for which Letters-Patent were granted to me on the 4th. day of December 1906 and designated by No. 837,541.

With this object in view, the invention consists in certain novel features of construction and combinations and arrangements of cent ledge 11 to form a short flange 15, parts as hereinafter set forth and pointed against which the front end of the transfer out in the claims. frame 12 abuts to form a light seal. The

In the accompanying drawings, Figures 1 rear end wall of the tray extends upwardly and 2 are perspective views of the device; the same distance as the side walls, as does Fig. 3 is a longitudinal sectional view; Fig. 4 also the end strip 10 against the inner face of is a transverse sectional view with a plate said end wall. The double end wall thus holder in position on the developer. formed, cooperates with portions of the sides 1 represents the developing tray, which 3 of the tray, to form a fluid chamber 16, the may be conveniently made of sheet metal bottom of which is a continuation of the botand provided with a bottom 2 which contom of the developing chamber .14 and said sists of a sheet of transparent glass or other chambers 14 and 16 are in free communicasuitable material, colored to prevent the pastion with each other, with no ledges or shoulsage of actinic light rays. The sides 3, 3, and ders between them. Therefore no splashing ends 4, 5 of the tray may be composed of a of developing fluid will occur when the latter single sheet of metal bent into rectangular is made to flow over a negative in the process form, or the front end 4 may be made sepa of developing the same. The fluid chamber rate and soldered to the sides. The metal of 16 is provided with a permanent sheet metal the sides and ends of the tray are bent incover 17 having a depending flange 18 at its wardly at their lower edges and provided at inner edge. The flange 18 terminates at its the inner edges with beads 6 on which the lower edge in a plane coincident with the colored glass bottom 2 of the tray rests. plane of the ledges 11 and is itself provided The beads 6 form gutters to receive cement, with a ledge 11. The top or cover 17 of the by means of which the glass bottom is sefluid chamber is provided with an opening cured in place. Against the inner faces of with which a tube 20 located in said chain'- the sides, metal strips 7, 7, are disposed, and her, may be made to communicate, for inthese strips are provided at their lower edges troducing the developing fluid. This inlet with flanges 8 which project over the side may be normally closed by means of a suitedges of the glass bottom2and are cemented able cap 21. The side ledges 11 may be to the latter. Similar strips 9, 10 are disstrengthened by means of posts 22, the lower posed against theinner faces of the end ends of which are provided with inwardly walls of the tray and provided at their lower projecting toes 23 resting upon the flanges 8. edges with flanges 8 which overlap the ends Upon these toes, the negative will be supof the glass bottom 2. The side strips 7 and front end strip 9 are provided at their upper edges with inwardly projecting flanges, which constitute ledges 11 for the reception of a removable transfer frame 12 having a colored transparent slide 13 which constitutes the top of the developing chamber 14 of the tray. Thus it will be seen that the chamber 14 is confined to the space below the ledges 11 and the transfer device which rests thereon, and that said chamber is made with double walls.

The sides 3, 3, of the tray project some distance above the ledges 11, and constitute, in effect, flanges which receive the transfer frame between and which also receive between them and serve as light seals for a plate holder as hereinafter more fully described. The front end 4 of the tray projects only a short distance above the adjaphotographic ported slightly above the glass bottom 2 dur- 1 ing the process of development. A post 241 is also located between the bottom 2 and the lower edge of the front wall or flange 18 of the fluid chamber to prevent the negative from entering the latter. The Wall or flange 18 is made with a slight depression 25 just over the adjacent ledge 11 and in this de pression, a spring 26 is secured and adapted to press against one end of the transfer frame 12 so as to press the other or front end of the latter, snugly against the flange 15 at the front end of the tray and thus insure a light seal at thispoint.

The transfer frame 12 hereinbefore referred to, may be made of wood or other suitable material and the slide 13 may be a thin sheet of transparent, colored celluloidv For the accommodation of the slide, one end of the transfer frame is provided with a slot, and the other end of the frame and the sides thereof are made with grooves.

The device constructed as herein described, is intended to receive a previously exposed plate from a plate holder, and permit the developing of the plate in the daylight, and without any necessity whatever for resort to a dark room, either for transferring a plate from a plate holder to the bath or in developing said plate.

In Fig. 4 of the drawing, 1 have shown a plate holder in the position which it will oceupy when a previously exposed plate is to be placed into the developing chamber. The

1' plate holder 27 is placed upon the transfer frame 12 within the chamber formed by the flanges of the sides 3. and end wall 18 so as to be closely embraced by said flanges and end wall, and said plate holder is provided in its under face near its front end with a rib to enter a groove 29 in the front ortion of the transfer frame 12 to form a lig itseal at this point.

In the drawing, Ihave shown a holder 27 :5 adapted for the reception of a single plate,

but it is evident that the ordinary double plate holder might be used. When the ordinary plate holder is used, the plate may be released from the holding spring commonly employed, by means of a lip 30 on the rear end of the transfer frame 12.

With the plate holder 27 in the position shown in Fig. 4 and the plate released from its holding means and resting up on the holder shutter 31, said shutter will be withdrawn for the purpose of permitting the plate to drop upon the slide 13 in the transfer frame. The shutter31 may now be replaced, and the slide 13 withdrawn to permit the plate to drop into the developing chamber. The plate having been thus deposited into the developing chamber, the slide will be replaced and the plate holder removed. The operator may now proceed to develop the negative, holding the device up to the light and looking through it from time to time to observe the process of development. hen the negative shall have been properly developed, the operator will remove the transfer frame and then he will have access to the plate for the purpose of removing it to a fixing bath. Be fore removing the plate from the developing tray, the operator may dispose the latter vertically to permit the developing solution to drain from the plate and enter the fluid chamber 1 6.

XVhen a plate holder is used, having ribs on its bottom near its sides and one end, and a groove near its other end,-one face of the transfer frame 12 is provided with grooves 32 parallel with its sides and one end to receive the ribs on the plate holder, and a rib 33 is provided near the other end of the transfer frame to enter a groove in the plate holder, for the purpose of forming light seals between such holder and the transfer frame.

Various slight changes might be made in the details of construction of my improved developing device, without departing from the spirit thereof as defined by the claims.

Having fully described my invention. what I claim as new and desire to secure by Letters-Patent, is

1. A day-light developer, comprising a tray having a transparent nen-aetinie bottom, and a removable transfer device embraced by the side walls of the tray and co1nprising a transparent non-aetinic slide constituting the top of the developing chamber, and a removable holder for said slide, said slide and its holder disposed below the upper edges of the side walls of the tray.

2. A day-light developer comprising a tray having a transparent, non-actinic bottom, ledges within said tray at the top of the developing chamber and below the upper edges of the walls of the tray, a removable frame mounted on said lodges and disposed below the upper edges of the side walls of the tray, and a trans' iarent non-actinic slide mounted in and carried by said removable frame and constituting the top of the developing chainher.

3. Adaydight developer comprising a tray having a developing chamber, and a fluid chamber communicating therewith, and having walls projecting above the top of the developing chamber, a removable frame disposed within the space bounded by said walls, and a transparent slide of non-actinic material carried by said frame and removable therewith.

1. A day-light developer comprising a tray provided with a transparent non-actinic bottom, said tray having a developing chamber and a fluid chamber in free communication with the developin chamber, a ledge around the top of thedeve oping chamber, posts under the side members of said ledge and lugs or toes at the lower ends of the posts fol-supporting a plate above the bottom of the tray, and a slide of transparent non-actinic material supported by said ledge.

5. A day-light developer, comprising a tray provided with a transparent non-actinic bottom and having a developing chamber, a transfer frame, a transparent non-actinic slide carried by said frame, and a lip projecting upwardly from one end of said frame.

6. A day light developer, comprising a tray having a developing chamber and a fluid chamber having free and unobstructed communication with the developing chamber, said tray having a plate extending from end to end thereof and constituting a continuous bottom for both of said chambers, a frame supported within the tray over the develop ing chamber and a transparent non-actinic slide carried by said frame and constituting the cover of the developing chamber.

7. A day light developer, comprising a tray provided with a transparent non-actinic bottom, strips disposed against inner walls of said tray and provided at their upper edges with flanges which constitute ledges, and a transfer frame resting on said ledges and provided with a transparent nonactinic slide constituting the top of the developing chamber.

8. A day-light developer comprising a tray having a non-actinic bottom and provided with ledges above said bottom, a flange at the front end of the tray projecting above the ledge at said front end, a removable frame resting on said flanges, a s ring to press the front end of the removab e frame against the flange at the front end of the tray, and a transparent non-actinic slide in said removable frame constituting the top of the developing chamber.

9. A day-light developer comprising a tray provided with a transparent non-actinic bottom and a developing chamber over said bottom, said developing chamber having double walls, ledges at the top of the developing chamber and below the top of the side walls of the tray, a frame resting on said ledges, and a transparent non-actinic slide in said frame.

10. A day-light developer comprising a tray having sides and ends provided at their lower edges with inwardly projecting flanges, a transparent non-actinic bottom resting upon said flanges and cemented thereto, ledges within said tray, and a transparent, non-actinic slide supported by said ledges and constituting the top of a developing chamber.

11. A day light developer comprising a tray having sides and ends provided at their lower edges with inwardly projecting flanges, a transparent, non actinic bottom resting on said flanges and cemented thereto, strips disposed against the inner faces of said sides and ends and provided at their lower edges with inwardly projecting flanges overlapping the edges of the transparent, non-actinic bottom, and a transparent, non-actinic slide disposed within the tray and constituting the top of a developing chamber.

12. A day-light developer comprising a tray provided with inwardly projecting flanges at the lower edges of its sides and ends, a transparent, non-actinic bottom resting upon said flanges and cemented thereto, strips disposed against the inner side faces of the sides and ends of the tray and provided at their lower edges with inwardly projecting flanges overlapping the edges of the transparent non-actinic bottom, the strips at the sides and one end of the tray having inwardly projecting flanges at their upper edges, and a transparent, non-actinic slide supported by said last-mentioned flanges and constituting the top of a developing chamber.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

FREDERICK O. BRADBURN.

Witnesses:

FRANK M. GoFF, MATILDA R. GUELIoH. 

